J/ApJ/890/7 Environment of galaxies in the 5 CANDELS fields (Chartab+, 2020)
Large-scale structures in the CANDELS fields: the role of the environment in
star formation activity.
Chartab N., Mobasher B., Darvish B., Finkelstein S., Guo Y., Kodra D.,
Lee K.-S., Newman J.A., Pacifici C., Papovich C., Sattari Z., Shahidi A.,
Dickinson M.E., Faber S.M., Ferguson H.C., Giavalisco M., Jafariyazani M.
<Astrophys. J., 890, 7 (2020)>
=2020ApJ...890....7C 2020ApJ...890....7C
ADC_Keywords: Galaxies, IR; Redshifts; Intergalactic medium
Keywords: Galaxy environments ; Galaxy evolution ;
Large-scale structure of the universe ; Galaxy quenching
Abstract:
We present a robust method, weighted von Mises kernel density
estimation, along with boundary correction to reconstruct the
underlying number density field of galaxies. We apply this method to
galaxies brighter than Hubble Space Telescope/F160w≤26 AB mag in the
redshift range 0.4≤z≤5 in the five CANDELS fields (GOODS-N, GOODS-S,
EGS, UDS, and COSMOS). We then use these measurements to explore the
environmental dependence of the star formation activity of galaxies.
We find strong evidence of environmental quenching for massive
galaxies (M≳1011M☉) out to z∼3.5 such that an overdense
environment hosts ≳20% more massive quiescent galaxies than an
underdense region. We also find that environmental quenching
efficiency grows with stellar mass and reaches ∼60% for massive
galaxies at z∼0.5. The environmental quenching is also more efficient
than stellar mass quenching for low-mass galaxies (M≳1010M☉)
at low and intermediate redshifts (z≲1.2). Our findings concur
thoroughly with the "overconsumption" quenching model where the
termination of cool gas accretion (cosmological starvation) happens in
an overdense environment and the galaxy starts to consume its
remaining gas reservoir in depletion time. The depletion time depends
on the stellar mass and could explain the evolution of environmental
quenching efficiency with stellar mass.
Description:
We use the HST/F160w (H-band) selected catalogs of the five CANDELS
fields covering a total area of ∼960arcmin2: GOODS-S
(Guo+ 2013, J/ApJS/207/24), GOODS-N (Barro+ 2019ApJS..243...22B 2019ApJS..243...22B),
COSMOS (Nayyeri+ 2017, J/ApJS/228/7), EGS (Stefanon+ 2017, J/ApJS/229/32),
and UDS (Galametz+ 2013, J/ApJS/206/10).
Throughout this work, we assume a flat ΛCDM cosmology with
H0=100h.km/s/Mpc, Ωm0=0.3, and ΩΛ0=0.7.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table2.dat 67 86716 Density field measurements
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See also:
B/hst : HST Archived Exposures Catalog (STScI, 2007)
J/ApJ/690/1236 : COSMOS photometric redshift catalog (Ilbert+, 2009)
J/MNRAS/423/3652 : H narrow-band images of XMMUJ2235.3-2557 (Grutzbauch+, 2012)
J/ApJS/206/10 : CANDELS multiwavelength catalog (Galametz+, 2013)
J/ApJS/207/24 : GOODS-S CANDELS multiwavelength catalog (Guo+, 2013)
J/ApJ/777/18 : Stellar mass functions of galaxies to z=4 (Muzzin+, 2013)
J/ApJS/214/24 : 3D-HST+CANDELS catalog (Skelton+, 2014)
J/ApJ/805/121 : Overdensities of 0<z<3 COSMOS galaxies (Darvish+, 2015)
J/ApJ/835/153 : Galaxy environment in 3D-HST fields (z=0.5-3) (Fossati+, 2017)
J/ApJS/228/7 : Multi-wavelength data in CANDELS COSMOS field (Nayyeri+, 2017)
J/ApJS/229/32 : CANDELS: multiwavelength catalogs in the EGS (Stefanon+, 2017)
Byte-by-byte Description of file: table2.dat
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Bytes Format Units Label Explanations
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1- 6 A6 --- Field Field (GOODSS, GOODSN, UDS, EGS, COSMOS)
8- 12 I5 --- ID [1/41441] ID based on the CANDELS photometry
catalogs
14- 24 F11.7 deg RAdeg Right Ascension, decimal degrees (J2000)
26- 36 F11.7 deg DEdeg Declination, decimal degrees (J2000)
38- 45 F8.6 --- z [0.4/5] Best redshift (1)
47- 52 F6.4 --- nc [0.0006/2.9] Comoving density,
in h3/Mpc3 units
54- 59 F6.4 --- np [0.1/9.84] Physical density,
in h3/Mpc3 units
61- 67 F7.4 --- delta [-0.77/12.31] Density contrast (2)
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Note (1): Spectroscopic redshift if it is available, or 3D-HST grism-z if
available and there is no spec-z, and finally photo-z when there is no
spec-z or 3D-HST grism-z available.
Note (2): Number density enhancement with respect to the average density in
the vicinity of the galaxy: (density/background density)-1
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History:
From electronic version of the journal
(End) Prepared by [AAS], Emmanuelle Perret [CDS] 20-Jul-2021